Electrical apparatus



y 1930-- w. H. F. SCHMIEDING 1,759,958

- ELECTRICAL APPARATUS Filed March 30, 1926 a #5 60 fin n5 I gvwwdoo Wm H y 33x fW-f ZZ m m 630: "w ll.

Patented May 27, 1930 UNITED STATES PATENT OFFICE WARREN H. F. SCHMIEDIN G, 01 DAYTON, OHIO, ASSIGNOR T0 DELCO-LIGET COMPANY, OF DAYTON, OHIO,,A CORPORATION OF DELAWARE ELECTRICAL APPARATUS Application filed March 30, 1926. Serial No. 98,628.

present invention will be apparent from the.

following description, reference being hadto the accompanying drawing, wherein a preferred form of the present invention is clearly shown.

The figure of the drawing is a wiring diagram illustrating the resent invention.

In the drawing, 20 esignates a prime mover, herein shown as an internal-combustion engine having ashaft 21 which drives a relatively high-voltage generator 22 having main brushes 23 and 24 connected with the armature of the generator, and having a series field winding 25 and a shunt winding 26.

The engine is started by a relatively low voltage series motor 27 which is normally disconnected from the engine, but may be connected automatically with the engine for cranking the latter whenever current is supplied to the motor; and which is automatically disconnected from the engine when the engine becomes self-operative. As various devices for automatically connecting and disconnecting the starting motor are well-known to those skilled in the art, illustration thereof is deemed unnecessary. One form of mechanical connection which may be used with this invention is described and claimed in 'the copending application of Frank F. Starr, Serial No. 47,717, filed August 3, 1925.

The engine ignition apparatus comprises an ignition coil primary 30, an ignition timer 81 and an ignition coil secondary 32 which is connected with an engine spark plug 33.

A relatively high-voltage work circuit which is supplied by the generator 22, includes a wire 40, contacts 41 and 42, wire 43, magnet coil 44, wire 48, translating devices such as lamps 49 each ofwhich is controlled by a switch 50, wire 51 and series field 25.

The battery charging circuit includes wire 40, contacts 41 and 52, wires 53 and 54, a relatively low-voltage storage battery 55, wire 26, a voltage-reducing rheostat 57 and wire The engine cranking circuit includes bat- 7 tery 55, wire 54, contacts 6.0 and 61, wire 62, motor 27 and wire 63.

To start the engine automaticall in response to a demand for current in t e work circuit, one of the switches 50 is closed, thereby causing current to flow from the low voltage battery 55 through the following circuit: Battery 55, wire 54, magnet coil 65 of starting switch 66, wire 48,.switch 50, lamp 49, wire 51, rheostat 57, and wire 56. Coil 65, rheostat 57 and translating devices 49 are of relatively high resistance. Therefore, the current flowing from the battery is small. However, the current flowing in this circuit is sufficient to actuate relay 66 thereby drawing plunger 67 upwardly to connect a movable contact 68 with the stationary contact 69. When contact 68 engages contact 69, current will flow from the battery through the magnet 70 of a starting switch 71, which includes a plunger 72 which, when moved upwardly, will cause contact 60, which is pivoted at 73, to engage contact 61. The circuit between the battery and the magnet 70 is as follows: Battery 55, wires 54 and 75, contacts 68 and .69, wire 76, movable contact 77,1:ontact 78, wire 79, contacts 80 and 81, wire 82, coil 70 and wire 83. The closing of contacts 60 and 61 will establish the cranking circuit previously described including motor. 27. 100

' 89 to separate contact 77 from contact The closing of the contacts 68 and 69 will connect the ignition coil rimary 30, the cirvcuit leading via wire 85, rom wire 79, thence the battery is prevented by a cranking cut-- out 86 which includes the contacts 77 and 78. The contact 78 is attached to a lever 87 which is pivoted at 88 and is urged upwardly by a spring 89. Upward movement of the lever 87 is normally restrained by its'engagement with the lower end of a bimetallic thermostat blade 90, which is fixed at 91. The blade 90 is in heat-receiving relation to a heating coil 92 which is connected across the battery terminals by connecting one end of the coil 92 with wire 82, and the other end with wire 11 63. The coil 92 of cut-out 102 is thus connected in parallel with the motor 27 during engine cranking and if the cranking of the engine should continue for an abnormal period, the bimetallic blade 90 will be-heated sufliciently to cause it to bow toward the left, as viewed in the drawing, until the lower end of the blade 90 moves past the shoulder 95 of the lever 87. When this occurs, the lever 87 will move upwardly under action of spripsg 7 thus interrupting the current to the ignition coil 30, the heating coil 92 and the magnet coil 70. Deenergization of the starting switch .71 permits plunger 72 to descend by gravity to move the contact 60 out of engagement with contact 61 thereby opening the starting circuit through the motor 27.

Should the engine become self-operative before the cranking cut-out 86, as ust described, the engine cranking circuit will be interrupted by a stop-cranking relay '100 which includes the contacts 80 and 81, magnet winding 101 and a magnetizable lunger 102. The relay winding 101 is norma 1y connected across the terminals of generator 22,

- and when the generator voltage reaches a certain relatively low value (less than normal), the magnet coil 101 will be energized sulficiently to attract the plunger 102 to separate contact 81 from contact 80. When this occurs, the circuit between the battery 55 and the winding of the starting switch 71 will be interrupted, thereby permitting the plungor 72 to descend and the contact 60 to be separated from contact 62.

The operation of relay 100 will establish a circuit through magnet coil 108 of stopping switch 109. Contact 81-carries a contact 103 arranged to engage contacts 114 and 115. When plunger 102 is attracted, current will flow through wires 54 and 116, contacts 115, 103 and 114, wire 117, coil 108, wire 48, switch 50, lamp 49, wire 51, rheostat 57 and wire 56.

Coil 108 comprises a relatively large number of turns of fine wire for the purpose of creating a relatively large number of ampere turns when a relatively low. amperage flows therethrough. The ampere turns created by coil 108 when only one low-wattage lamp is connected across the mains 48 and 51 is sufiicient to attract a plunger 110. The attraction of plunger 110 will cause a contact 111 to be lifted and engage a contact 112 which is connected with wire 76 to establish an auxiliary ignition circuit including: lrVires 54 and 113, contacts 111 and 112, .wire 76, contacts 77 and 78, wires 79 and 85, primary 30, timer 31 and wire 63. At this stage of theoperation two parallel ignition circuits for primary 30 are provided, namely the circuit just described and the one previously described, which latter includes wires and contacts 68 and 69.

Itlis to be understood that when relay 100 operates,the generator 22 is not yet up to full speed and full voltage, but when the generator does attain substantially its full relatively high voltage, load switch 104 will automatically connect the generator with a work circuit previously described including coil 44 of stopping switch 109. The switch 104 includes a magnet coil 105 normally connected across the terminals of generator 22 in parallel with coil 101 of relay .100. When the voltage across the generator terminals attains a certain value, coil 105 will be energized to attract a plunger 106 thereby causing contact 41 to en age contacts 42 and 52.

ontact 41 engages contact 52 before it engages contact 42 thereby completing the bat tery charging circuit previously described before the circuit is completed through coil 44. Then when contact 41 engages contact 42, the low resistance circuit through wire 43 will cause coil 108 of stopping switch 109, and coil 65 of starting switch relay 66, to be shortcircuited because the resistance of the circuit for coil 108, which includes respective wire 116 branching from wire 54, contacts 115,103, 114, wire 117 and the high resistance coil 108 connect to wire 48, is higher than the resistance in the circuit including wire 43 and coil 44 which is also connected with wire 48. Likewise the resistance including coil 65, which is connected with wires 54 and 48, is

higher than the resistance of the circuit including coil 44. When coil 108 is rendered ineffective, as just described, contacts 111 and 112 will be held in engagement merely by the coil 44. Since coil 65 is short-circuited its co-operating plunger 67 will fall by gravity, whereby contact 68 will be separated from contact 69 and then the ignition circuit will be rlzcintrolled solely through contacts 111 and 2. Since coil 44 is in series with the work circuit, ignition will be maintained for the engine, during normal operation, as long as there is a demand for current by the translating device, but when the demand in the work circuit ceases, no current will flow through coil 44. When this occurs, the plunger 110 will fall by gravity, causing contact 111 to separate from contact 112, to break the ignition circuit to the engine, whereby the generating operation will cease.

small amperage flows therethrough. Therefore, the switch can be made relatively small since the arrangement is such that the switch is closed by the tine winding coil, and only such number. of coarse wire turns need be provided as are necessary for maintaining said 3 contacts closed and since only a'few coarse.

.wire turns are necessary, the switch may be made relatively small.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, 'all coming within the scope of the claims which follow.

What is claimed is as follows:

1. An electrical generating system comprising, incombination, a prime mover; a

storage battery; a work circuit; electrical apparatus connected with the prime mover and battery for starting the prime mover and for thereafter supplying current to the work circuit; a prime mover control device; a mag netic controller for rendering said device operative; and switch apparatus including a high resistance coil connected across the battery, a circuit for said coil arranged in series relation with the work circuit and adapted to be controlled after the prime mover is selfoperative, and means actuated by said coil for controlling said control device independently of said controller. I

2. An electrical generating system comprising, in combination, a prime mover; a storage battery; a work circuit; electrical apparatus connected with the prime mover and battery for starting the prime mover and for thereafter supplying current to the work circuit; a prime mover control device; plural control circuits for said device; a magnetic controller for rendering one of said control circuits operative; andswitch apparatus including a coil connected across the battery, a circuit for said coil adapted to be controlled after the prime mover is self-operative, means actuated by said coil for rendering another of said-control circuits operative, and a current coil arranged in series relation with the work circuit and cooperating with said means for maintaining the same operable independently of said first coil.

3. An electrical generating system comprising, in combination, a prime mover; a storage battery; a work circuit; electrical apparatus connected with the prime mover and battery for starting the prime mover and for thereafter supplying current to the work circuit; a prime mover control device; plural control circuits for said device; a magnetic controller for rendering one of said control circuits operative; and switch apparatus including a coil connected across the battery, a circuit forsaid coil adapted to be controlled after the prime mover is self-operative, means actuated by said coilfor rendering another of said control circuits operative, and means operated subsequently to said coil for maintaining the first means operative independently of said coil.

4. An electrical generating system comprising, in combination, a prime mover; a storage battery; a work circuit; electrical apparatus connected with the prime mover and battery for starting the prime mover and thereafter for supplying current to the work circuit; a prime mover controldevice; a magnetic controller for rendering said device op erative; and switch apparatus including a coil connected across the battery, a circuit for said coil adapted to be controlled after the prime mover is self-operative, means actuated by said coil for controlling said control device, and means operated subsequently to said coil for maintaining the first means operative and for causing said coil to be deenergized.

5. An electrical generating system comprising, in combination, a prime mover; a storage battery; a work circuit; electrical apparatus connected with the prime mover and battery for starting the prime mover and for thereafter supplying current to the work circuit; a prime mover control device; a controller includin a coil adapted to be energized for rendering said device operative ;and switch apparatus including a coil connected across the battery, a circuit for said coil adapted to be controlled after the prime mover is self-o erative,,means actuated by said second coil or controlling said control device, and means for causing said first coil to be deenergized, said means including a current coil arranged in series relation with the work circult and adapted to maintain said first means operative.

6. An electrical generating system comprising, in combination, a prime mover; a storage battery; a work circuit; electrical apparatus connected with the prime mover and battery for starting the prime mover and for thereafter supplying current to the work circuit; a prime mover control device; a controller for including a coil adapted to be energized for rendering said device operative; and switch apparatus including a coil connected across the battery, a circuit for said coil adapted to be controlled after the prime 5 mover is self-operative, means actuated by said coil for controlling said control device, and'means for causing said coils to be deenergized, said means including a current coil arranged in series relation with the work cirm cuit and adapted to maintain said first means operative.v

7 An electrical generating system comprising, in combination, a prime mover; a storage battery; a work circuit; electrical apparatus connected with-the prime mover and battery for starting the prime mover and thereafter for supplying current to the work circuit; a prime mover control device; a mag netic controller including a coil adapted to be energized for rendering said device. operative; and switch apparatus includin a coil connected across the battery, a circuit or said coil adapted to be controlled after the prime mover is self-operative, means actuated by said coil for controlling said control device, and means operated subsequently to said coil for maintaining the first means operative and V for causing said coils to be deener zed.

In testimony whereof I hereto a x my signature.

WARREN H. F. SGHMIEDING. 

